In exercising, a weight lifter loses 0.150 kg of water through evaporation, the heat required to evaporate the water coming from the weight lifters body. The work done in lifting weights is 1.40 × 105 J.
(a) Assuming that the latent heat of vaporization of perspiration is 2.42 × 106 J/kg, find the change in the internal energy of the weight lifter.
(b) Determine the minimum number of nutritional Calories of food (1 nutritional Calorie = 4186 J) that must be consumed to replace the loss of internal energy.